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"Energy companies stayed old school for a very long time due to high oil prices — it was easy to make money just doing what they did. The price drop forced them to find innovative ways to make a profit," said Li.

"Even if 70 percent of them can be recycled, that means some 60,000 tons will fall into disuse by 2020. Without proper means of disposal, they will bring about environmental and safety risks and result in a waste of resources," the ministry said.

"FDI expanded 8.4 percent year-on-year in the second quarter, showing that the expectations and confidence of foreign investors are improving. In face of a complex and grave world economic situation with increasing uncertainties, there is still a lot work ahead to meet the annual target of stabilizing the inbound investment," said Gao Feng, a ministry spokesman.

"Falling Chinese rates could make holding dollar assets relatively more attractive than holding renminbi assets, resulting in a drain of funding from the system as money leaves the country," said He.

"Energy and chemicals are important to a country's economy, and a key driver for development," said Yulin Mayor Li Chunlin.